Saccharomyces cerevisiae RC016 modulates the apoptotic pathways in rat livers treated with aflatoxin B1
In: World Mycotoxin JournalConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
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Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
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Departamento de Producción Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, Argentina.
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Departamento de Microbiología e Inmunología Facultad de Ciencias Exactas Físico Químicas y Naturales Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.
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The aim was to study the effect of probiotic Saccharomyces cerevisiae RC016 on the expression of apoptotic protein Bax, Bcl-2, DR4 and c-FLIP, in liver of rats exposed to aflatoxin B1 (AFB1). Four treatments were applied to inbred male Wistar rats: uncontaminated feed control, S. cerevisiae RC016 control, contaminated feed with 100 μg/kg AFB1 and contaminated feed with 100 μg/kg AFB1 + daily oral dose 108 viable S. cerevisiae RC016 cells. Histological technique and high-resolution light microscopy (HRLM) were performed to the study of tissue morphology, the TUNEL assay was used to determine the apoptosis cellular and the expression of Bax, Bcl-2, DR4 and c-FLIP was determinate through immunohistochemistry. In liver the necrotic lesions observed with AFB1 treatment were reduced with the addition of yeast. The highest apoptotic index (IAp) was found in the yeast control, with AFB1 decrease significantly the IAp, while with the addition of yeast increase the IAp of liver cells. This was confirmed by HRLM. DR4 receptor was not present in any of the treatments. The immunolabeling of c-FLIP showed a statistically significant increase in the treatments with S. cerevisiae. The extrinsic pathway of apoptosis through the FAS-receptors would neither be active in the apoptotic process observed in rat livers in the treatments with yeast. Significant differences between proteins Bax and Bcl-2 and effect of treatments on the immunolabeling of Bax were determinate. The exposure to AFB1 decreased the IAp in the livers; while the addition of the yeast produced a significant statistically increase of IAp. In this study it was determined that the apoptosis in liver would be induced by the intrinsic pathway through Bax. These suggest that the incorporation of the autocrine strain S. cerevisiae RC016 increases the apoptosis in liver, counteracting the adverse effect of aflatoxin B1 and favouring the tissue remodulation.
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Saccharomyces cerevisiae RC016 modulates the apoptotic pathways in rat livers treated with aflatoxin B1
In: World Mycotoxin JournalConsejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
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Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
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Departamento de Producción Animal, Facultad de Agronomía y Veterinaria, Universidad Nacional de Río Cuarto, Córdoba, Argentina.
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Departamento de Microbiología e Inmunología Facultad de Ciencias Exactas Físico Químicas y Naturales Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.
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The aim was to study the effect of probiotic Saccharomyces cerevisiae RC016 on the expression of apoptotic protein Bax, Bcl-2, DR4 and c-FLIP, in liver of rats exposed to aflatoxin B1 (AFB1). Four treatments were applied to inbred male Wistar rats: uncontaminated feed control, S. cerevisiae RC016 control, contaminated feed with 100 μg/kg AFB1 and contaminated feed with 100 μg/kg AFB1 + daily oral dose 108 viable S. cerevisiae RC016 cells. Histological technique and high-resolution light microscopy (HRLM) were performed to the study of tissue morphology, the TUNEL assay was used to determine the apoptosis cellular and the expression of Bax, Bcl-2, DR4 and c-FLIP was determinate through immunohistochemistry. In liver the necrotic lesions observed with AFB1 treatment were reduced with the addition of yeast. The highest apoptotic index (IAp) was found in the yeast control, with AFB1 decrease significantly the IAp, while with the addition of yeast increase the IAp of liver cells. This was confirmed by HRLM. DR4 receptor was not present in any of the treatments. The immunolabeling of c-FLIP showed a statistically significant increase in the treatments with S. cerevisiae. The extrinsic pathway of apoptosis through the FAS-receptors would neither be active in the apoptotic process observed in rat livers in the treatments with yeast. Significant differences between proteins Bax and Bcl-2 and effect of treatments on the immunolabeling of Bax were determinate. The exposure to AFB1 decreased the IAp in the livers; while the addition of the yeast produced a significant statistically increase of IAp. In this study it was determined that the apoptosis in liver would be induced by the intrinsic pathway through Bax. These suggest that the incorporation of the autocrine strain S. cerevisiae RC016 increases the apoptosis in liver, counteracting the adverse effect of aflatoxin B1 and favouring the tissue remodulation.
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